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UNITED STATES PATENT OFFICE.

JOHAN Il. KNIG, OF BALTIMORE, MARYLAND.

oABlNET-MAKERS CLAMP.

SPECIFICATION forming part of Letters Patent No. 226,617, dated April 20, 1880.

Application filed September 16, 1879.

To all whom it may concern:

Beit known that I, JOHAN L. KNIG, of the city of Baltimore, State of Maryland, have lthe glue. The clamp Inost commonly used for this purpose consists, essentially, of a pair of bars connected together by two screws, the bars being brought together upon turning the screws', but this form of device, though almost universally used, is open to the objection that it involves the loss of considerable time in adjust-ing the bars truly parallel and in turning up the screws.

To remedy this evil numerous clamps have been devised,4 consisting, as a rule, of a bar provided with a transverse end piece and a jaw sliding upon the bar, similar to an ordinary monkey-wrench. The bar was ratcheted or corrugatedto enable the sliding jaw to catch and hold upon it, the jaw being' furnished with the usual clamping-screw. rlhe evil above mentioned was thereby obviated, as the device admitted of rapid adjustment; but the peculiar construction necessitated its being made of metal, causing the device to be weighty and unhandy. Besides, the ratchetteethafforded holding-points at fixed intervals only, so that the screw had to be turned up, on an average, through half a tooth interval in order to clamp the Work.

My invention has for its object to furnish a light strong clamp of the monkey wrench class, whose sliding bar is adapted to catch at any point in the length of the main bar, admitting of the work being clamped by the slightest turn of the screw.

In the accompanying drawings, A is the main bar, preferably of hard Wood, having a transverse piece, a, secured thereto at right angles. B is the sliding jaw, mortised for the passage of the bar A, and having one or more knife-edges, b b', in the mortise to catch upon the bar A. O is the clamping-screw passing through the end of the jaw.

In operation the handle c of the screw is tilted away from the bar A, releasing the knife-edges b b', and admitting of the jaw B being slid up and down the bar. rIhe jaw is then slid up upon the bar until the screw about touches the work to be clamped, when a turnA or two of the screw secures it, the knifeedges being caused to bite into thc faces of the bar A.

The device answers every requisite, being light, strong, durable, and effective, and requiring the minimum of time for adjustment.

I am aware of Letters Patent No. 153,206, July 21, 1874, and disclaim the construction therein shown.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is l The cabinet-makers clamp herein described, consisting of the wooden bar A, having transverse piece a, and the mortised sliding bar B and screw C, the mortise in the bar being furnished with knife-edges near its upper, outer, and lower inner edges, whereby the walls of the mortise abut against the bar A when the knife-edges are fully entered, as and for the purpose set forth.

Witness my hand this 10th day of September, 1879.

JOHAN L. KNIG.

Witnesses:

R. D. WILLIAMS, J. G. GIT'IINGEE. 

